t's 75-85% the same game as Explorers of Time/Darkness. Yes there are new dungeons to explore, shops to purchase things from, and five side stories that let you play as new Pokemon, but it's still hard to recommend the game at full price to anyone who had played EoT/D. If you've never played a Pokemon Mystery Dungeon game, then this is certainly the one to get as it's got all the extra bells and whistles you could hope for.
In the end though, Chunsoft's attempt to recreate the remix magic in games like Pokemon Yellow, Crystal, Emerald or Platinum falls short because all of those games remixed the main plot in addition to bonus content. It all comes down to your love of the Fushigi Dungeon style of gameplay and whether or not you played the original version(s) of this game two years ago.